20013113013221 has 8 divisors (see below), whose sum is σ = 20025894439800. Its totient is φ = 20000334594240.

The previous prime is 20013113013217. The next prime is 20013113013233. The reversal of 20013113013221 is 12231031131002.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2000770644196 + 18012342369025 = 1414486^2 + 4244095^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20013113013221 - 2² = 20013113013217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20013113013193 and 20013113013202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20013113013721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12636731 + ... + 14131991.

It is an arithmetic number, because the mean of its divisors is an integer number (2503236804975).

Almost surely, 2^{20013113013221} is an apocalyptic number.

It is an amenable number.

20013113013221 is a deficient number, since it is larger than the sum of its proper divisors (12781426579).

20013113013221 is a wasteful number, since it uses less digits than its factorization.

20013113013221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1503799.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 20013113013221 its reverse (12231031131002), we get a palindrome (32244144144223).

The spelling of 20013113013221 in words is "twenty trillion, thirteen billion, one hundred thirteen million, thirteen thousand, two hundred twenty-one".